In the ocean, many sharks have a smaller fish known as a remora attached to them. Remoras have a sucker on the top of their heads that’s that they can use to attach to the shark. On the top of their heads that they can use to attach to the shark. In this way, they can hitchhike a ride as the shark swims along. When the shark feeds, the remora reattaches. The shake does not appear to be positively or negatively affected by remoras.